What proportion of all pregnancies will last between 240 and 270 days (Normal Distribution)

Questions :

The length of human pregnancies from conceptions to birth approximates a normal distribution with a mean of 266 days and a standard deviation of 16 days.

a. What proportion of all pregnancies will last between 240 and 270 days (roughly between 8 and 9 month)
b.What length of time marks the shortest 70% of all pregnancies?

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